Gear Setup ?

mcconnell

Well-Known Member
Joined
Mar 11, 2007
Location
Apex, NC
I’m taking my first shot at setting up gears in a HP 30 for my wife’s TJ. I was looking over everything before I started assembling and noticed the outer pinion bearing won’t slide over the new pinion the way it does the stock pinion. It’s a new Spicer SVL gear set and I tested with the old bearing and the new one from my Yukon kit. There is a visible machining line where it hangs up.

I put the pinion in the shop fridge for a while and warmed up the pinion a bit and it still didn’t drop on. Seems to measure 1.126” versus 1.1245-1.125” for the stocker.
Do I give it a little more heat and draw it on with the nut or is this gear set junk?
 

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If it were me, I'd do one of two things.
1- lube the bearing or the pinion shaft, install bearing, and draw down with the nut and yoke. See if it slides down fine.
2- hit the pinion with a flap wheel for a few seconds.
3- you did verify the bearing kit is for a HP30, correct? The outer bearing is different from a LP30.
 
2nd pattern is getting close, I think? Backlash is at 0.004 and pinion bearing preload is at 10in/lb. those drifted out when adding pinion depth for this pattern. Maybe another 5thou under the race?
 

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Went 0.010 on the pinion but think it could use a little more. Backlash up to .006.
 

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Last edited:
You absolutely need more pinion depth. It'll take a good chunk to bring it in where it should. I would go 5 more and be ready to add more.
Like @Chris_Keziah said, the coast is looking much better than drive. You will likely end up with a slightly deep coast side once you get drive acceptable. That happens sometimes.
When you add depth, you'll lose se backlash. So you'll need to open it up some as you go deeper.
Nice work. You're getting there!
 
Had time to get back to it this evening. BL is a little out at .012” and pinion bearing preload is a little tight at 16-17in.lb. Pinion is definitely deeper, but deep enough?
 

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Go another 5 thou deeper and get that BL to around 8.
Then rerun the pattern. You're getting closer but still needs to come in.
 
Jody Treadway said:
That's about as good as it'll get. The pattern is centered on both axis and is neither deep.or shallow
Nice work!
Click to expand...
Looks a little deep to me, but I'd still run it.
 
jeepinmatt said:
Looks a little deep to me, but I'd still run it.
Click to expand...
The coast side is definitely just a little bit deep. however the drive side is so good that I would not want to make any adjustments to move the pattern further up the tooth towards being a little bit shallow.
with all of the issues he has had with this one getting the pattern dialed in it makes me think this is about as good as it'll get. He may have to sacrifice one side for the other.
 
Jody Treadway said:
The coast side is definitely just a little bit deep. however the drive side is so good that I would not want to make any adjustments to move the pattern further up the tooth towards being a little bit shallow.
with all of the issues he has had with this one getting the pattern dialed in it makes me think this is about as good as it'll get. He may have to sacrifice one side for the other.
Click to expand...

If this was an LP axle that used the coast side for forward motion would you pursue a better pattern on that side?

Duane
 
CLRracer said:
If this was an LP axle that used the coast side for forward motion would you pursue a better pattern on that side?

Duane
Click to expand...
Yes I would. I would decrease shim thickness maybe 3-5 and see what happens to the (new) coast side. You typically get that floating decel gear whine when the coast is too shallow. So, I would be paying plenty of attention there.
Sometimes you have to choose drive or coast as which one gets the best pattern. Depending on useage, you make that call.
 
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